B3000 2WD V6-3.0L OHV (1994)
Idle Speed: Adjustments
Base Idle Speed
NOTE:
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The base and fast idle speeds are controlled by the Powertrain Control Module (PCM) and the Idle Air Control Solenoid. The Idle Air Control
Solenoid is not adjustable. A large increase or decrease in closed plate airflow from the calibrated level will not allow this device to control the
speed.
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The idle speed setting procedure has been revised considerably to reflect the expanded application of the Self-Test idle speed options and because
the throttle body incorporates an orifice in the throttle plate to control idle airflow as part of the sludge tolerant design.
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A plug in the throttle body orifice will decrease idle rpm. Where as an orifice without a plug will increase idle rpm. Orifice plugs and installation
tools are available in service kit # FOPZ-9F652-A.
WARNING:
Throttle bodies with sludge tolerant design must NOT be cleaned inside the bore, as this cleaning will impair the sensitive coating. The
sludge accumulation will not affect the idle air flow.
PREPARATION
Remember: A change in idle airflow can occur not only at the throttle body but other areas as well. You should enter the idle speed procedure
only after other possible causes in the following areas are eliminated.
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Contamination within the idle speed control device
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Lack of fuel system control (excessively rich or lean)
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Throttle sticking or binding
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Engine not reaching operating temperature
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Incorrect ignition timing
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Incorrect or clogged PCV system
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Vacuum leaks (intake manifold, vacuum hoses, vacuum reservoirs, power brake booster etc.
Verify
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Transmission is in PARK (A/T), or NEUTRAL (M/T)
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Parking brake is applied (automatic brake disconnected where applicable)
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Wheels blocked
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Engine at operating temperature
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Proper fuel pressure and no exhaust smoke
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Correct and clean PCV system
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Heater, A/C, and other accessories Off
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Ignition timing is set to specification
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Engine Control diagnostics have been performed and vehicle malfunction Diagnostic Trouble Code(s) (DTC)s have been resolved.
IDLE SPEED CHECK
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Perform Preparation. (Refer to above).
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Connect the Special Service Tool (SST) Super STAR II Tester to the data link connector.
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Activate the Key On Engine Running self-diagnosis inspection.
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After Diagnostic Trouble Code (DTC) 111 has been displayed, unlatch and within 4 seconds, latch the "HOLD TEST" button.
